A Linear Active Disturbance Rejection Control Based Sensor lessControl for IPMSMs Considering Harmonic Current Suppression

This paper presents a linear active disturbance rejection control (LADRC)-based sensorless control for interior permanent-magnet synchronous motor (IPMSM) drives considering harmonic current suppression. Firstly, a LADRC is developed in an estimated synchronously rotating reference frame to directly estimate back electromotive force (EMF), which is treated as a disturbance, without using low-pass filter or switching function. Then, the rotor position and speed are obtained from the estimated back EMF without any phase delay or speed chattering problem. Secondly, the periodically oscillating position estimation error caused by the harmonic current is analyzed and then a novel harmonic current controller based on second order generalized integrator (SOGI) and phase-locked loop (PLL) is proposed to further improve the rotor position estimation performance. Finally, the performance of the proposed LADRC-based sensorless control with harmonic current suppression is validated by simulation results for a 200-W IPMSM drive system.